Cavity-enhanced optical frequency comb spectroscopy (CROSBI ID 579426)
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Podaci o odgovornosti
A. Foltynowicz, P. Maslowski, T. Ban, K. C. Cossel, and J. Ye
engleski
Cavity-enhanced optical frequency comb spectroscopy
Optical frequency combs are produced by mode-locked lasers, whose spectrum spans hundreds of terahertz of bandwidth and consists of a series of equidistant narrow lines with frequencies given by, where is the repetition rate of the laser and is the carrier envelope offset frequency. The two radio frequencies can be directly measured and adjusted, providing full control over each individual comb line and making the frequency combs an excellent tool for precision metrology. In spectroscopy, the frequency combs can be used as frequency reference for continuous wave laser measurements, or, more powerfully, to perform the measurements directly. Direct frequency comb spectroscopy (DFCS), which is virtually equivalent to a simultaneous measurement with tens of thousands of narrow laser lines, combines the large spectral bandwidth of the comb with the high resolution of each comb line, allowing simultaneous detection of many molecular trace species . Moreover, the equidistant spectrum of the comb can be matched to that of an external enhancement cavity, providing efficient coupling and enhancement of the interaction length with the sample. Due to the dispersion in the cavity mirrors, the free spectral range of a cavity varies as a function of optical frequency, which usually prevents simultaneous coupling of the entire comb spectrum into the cavity. Another issue is the laser frequency-to-amplitude noise conversion, which plagues all cavity-enhanced techniques. Various detection methods and comb-to-cavity coupling schemes have been developed to overcome these two limitations, allowing cavity-enhanced (CE-) DFCS to reach sensitivities in the 10*(^-10) cm-1 Hz-1/2 range. Due to the combination of high sensitivity, broad spectral bandwidth, high resolution and fast acquisition times CE-DFCS has the potential of becoming the ultimate tool for applications such as precision spectroscopy and trace gas detection for breath analysis or atmospheric research.
frequency comb; cavity enhanced spectroscopy
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Podaci o prilogu
2011.
objavljeno
Podaci o matičnoj publikaciji
Book of abstracts
Podaci o skupu
User Meeting and Summer School Cavity Enhanced Spectroscopy
pozvano predavanje
26.06.2011-29.06.2011
Kingston, Kanada